constantsum
nounUK /ˈkɒnstənt sʌm/
US /ˈkɑːnstənt sʌm/
A constant sum is a total that always stays the same, no matter how the parts change.
In the game, the two players' scores always added up to ten, so ten was their constant sum.
OTHER MEANINGS
2. In mathematics, a quantity whose value does not change when other variables in an expression change.
The equation x + y = 12 has a constant sum of 12 for every pair of values.
3. A rule in some games or puzzles where the combined points of all players must always equal the same number.
The card game uses a constant sum of 21 across all hands.
4. In economics, a situation where the total of competing shares remains fixed even as individual shares shift.
The market was a constant-sum game because one company's gain was exactly another's loss.